Would you mind explaining how wishlisting a game helps the devs? Is it an algorithm thing? Will it be shown to more people when it is being wishlisted more?

I haven't found any third party stores with steam decks in stock. There are some who sold the old model so maybe in some time there will also be OLED versions available.

It's not officially sold in Switzerland. I could order it to a german adress but I would also need a german payment method which I dont have.

Sadly, I still can't buy it in Switzerland.